Air-injector for furnaces



(No Model.)

J. B. DAVIS 8v WLWALKER.

AIR INJECTOR FOR FURNAGES. No. 266,109. Patented 001;. 17, 1882.

Nrrien FATENT Free.

JOHN B. DAVIS AND WILLIAM WVALKER, OF GLEN WOOD, PENNSYLVANIA.

AIR-INJECTOR FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 266,109, dated October17, 1882.

' Application filed June 16, 1882. (No model.)

To alt whom it may concern Be it known that we, JOHN B. DAVIS andWILLIAM WALKER, of Glenwood, in the county of Lackawanna and State ofPennsylvania, have invented a new and Improved Air-Injector forFurnaces, of which the following is a full, clear, and exactdescription.

Our invention consists in an air-blast or injecting apparatus for usewith lolacksmiths forges and furnaces for the supply of air there to bymeans of a steam-jet, whereby the air is applied in a moist condition,or in the presence of moisture, to facilitate combustion, as hereinafterfully described, and pointed out in the claim.

The invention is especically applicable to furnaces and forges in whichanthracite and bituminous coal and culm are burned.

The construction and operation are set forth in detail hereinafter.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure l is a sectional elevation, showing our improved air-injector asapplied in connection with a forge. Fig.2 is a plan view of theinjector.

A represents a forge to which the air is applied by a nozzle, a. B is atrunk of wood or metal, to the lower end of which is connected thenozzle a, and which is fittedat the upper end with a steam-jet pipe, I).The upper end of the trunk Bis open for the inlet of air around thepipeb, and the pipebis to be supplied with steam from a suitable generator.

The successful operation of this apparatus is dependent upon the lengthand proportionate size of the trunk B. From its outer and inlet end thesides of the trunk are drawn inward and focused to a point, 0, beyondthe end of the steam-jet I). From that point the trunk graduallyenlarges to the outlet end, which is slightly smaller than theinlet-opening. The length tbetween the throat c and the connection ofthe nozzle a should be such as to insure the passage of theair throughthe trunk, as if such length be made too short it will not give thesteam the required room for expansion, and the air will not passthrough.

' Further, the nozzle to being of small diameter, a pressure ismaintained in the trunk, insuring a steady and uniform blast of air tothe forge or furnace.

' In operation the steam passing through the apparatus with the airbecomes partially condensed, so that it enters the forge or furnace inthe form of fine particles of moisture, which aids the combustion of thefuel and prevents furnace-bars, forge-boxes, and grates from burning,and is especially advantageous in burning culm for generating steam andconsuming the sulphur in anthracite and bituminous coal. The nozzle topasses through a water-boX, as illustrated at G, for insuring thecondensation of the steam to the desired extent.

With this apparatus a more advantageous blast is insured than can beobtained by a blower or fan, and it is also more economical inoperation. In the burning of anthracite andbituminous coal the steam hasthe effect to remove or insure the combustion of all the sulphur,which,unless removed, interferes with weldiu g operations. This has heretoforebeen found to be the disadvantage of using anthracite or bituminous coalcontaining sulphur in welding operations; but by our apparatus, whichsupplies steam with the air, the sulphur is entirely consumed.

The tube E projects downward from the nozzle a, and is to receive thecondensation-water. At its lower end it is provided with a plug, E,which can be opened to draw off this condensation water, which iscondensed by the water 0 surrounding the nozzle a, whereby thiscondensation-water will not be forced into the fire.

Having thus fully described our invention, we claim as new and desire tosecure by Letters Paten t- In an air-injector, the combination, with thetrunk B, of'the outlet-nozzle a, the water-box O, and thecondensation-water receptacle E, extending downward from the nozzle a,substantially as shown and described.

JOHN BENSON DAVIS.- WILLIAM WALKER.

